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Shield volcanoes are formed by lava flows of a low viscosity. Chuck Wood took this picture in 1979 while sailing around Fernandina island. Fernandina, the most active of Galápagos volcanoes and the one closest to the Galápagos mantle plume, is a basaltic shield volcano with a deep 5 x 6.5 km (3.1 to 4 miles) summit caldera. It has produced nearly 30 recorded eruptions since 1800, with the most recent events having occurred along radial or circumferential fissures around the summit crater. The volcano displays the classic "overturned soup bowl" profile of Galápagos shield volcanoes. A phenomenon known as tumescence is what serves as the geomechanical force that prevents these volcanoes from erupting in an explosive way. This type of volcano is built up over time as the lava buildup increases and is shaped like a "turtle back". The eruption started a few days prior, so the sea lions at the end probably aren't swimming away in terror. Fernandina, the most active of Galápagos volcanoes, is a basaltic shield volcano with a deep 4 x 6.5 km summit caldera. This volcanic island has an elongated summit caldera roughly 5 kilometers by 6.5 kilometers (3 by 4 miles) wide, and fissures on the caldera’s outskirts have facilitated the volcano’s growth over time. The volcano displays the classic "overturned soup bowl" profile of Galápagos shield volcanoes. Volcano erupting in the Galapagos. One big difference though is that Fernandina is an uninhabited island of the Galapagos. Fissure eruption produced lava flows during 12-13 January 2020 Fernandina is a volcanic island in the Galapagos islands, around 1,000 km W from the coast of mainland Ecuador. Fernandina, the most active of Galápagos volcanoes and the one closest to the Galápagos mantle plume, is a basaltic shield volcano with a deep 5 x 6.5 km summit caldera. Isla Fernandina is a shield volcano with a low, broad shape that resembles an ancient warrior shield. A bassaltic shield volcano is a large volcano with shallow sloping sides. Flat-topped benches mark the SE and NW ends of the elliptical caldera. Photo by Tom Simkin, 1968 (Smithsonian Institution). Fernandina Volcano in the Galapagos islands is a shield volcano.